NOVEL INTERMEDIATES AND PROCESS TO PYRIMIDINEDIONE HERBICIDES

摘要

A class of novel intermediates is described that have utility in processes for preparing uracil herbicides; wherein the novel intermediates are compounds of formula (A) which are cyclized with at least one cyclizing agent of formula (B) to provide a penultimate intermediate to, or a uracil herbicide, both of formula (I) where (X)n, Y, Z, R, R<1>, R<5>, R<7>, and R<8> are fully described herein. Preferred are those where Y and Z taken together are -N=C(R<2>)-NR<3>-, (X)n is 4-fluoro-6-chloro; R is hydrogen and methyl; R<1> and R<2> are trifluoromethyl, and R<3> is hydrogen.